US 6,656,331 B2 · Application of antistatic/antireflective coating to a video display screen

Abstract

An antistatic/antireflective coating is applied by sputtering to the outer surface of a video display screen such as in a cathode ray tube (CRT) and is comprised of an inner antistatic layer and an outer antireflective layer. The inner antistatic layer is conductive, while the outer antireflective layer is insulative. The inner antistatic layer is deposited on the entire outer surface of the display screen, while a portion of the antistatic layer is masked during deposition of the outer antireflective layer leaving a portion, or portions, of the inner antistatic layer exposed. The exposed portion, or portions, of the antistatic layer is then electrically coupled to the CRT's grounded implosion protection, or tension, band for safely directing electrostatic charge on the display screen to neutral ground.

Claims8

Dependent claims

A method for applying an antistatic/antireflective coating to an outer surface of a glass display screen of a CRT, wherein a video image is produced on the glass display panel by plural electron beams incident upon a light emitting coating disposed on an inner surface of said glass display screen, and wherein an electrostatic charge is produced on said display screen by said electron beams incident thereon and incident light is reflected by said display screen, said method comprising the steps of:

applying an electrically conductive antistatic layer by sputtering to the outer surface of the glass display screen;
masking a peripheral portion of said antistatic layer;
and
applying an insulative antireflective layer on said antistatic layer by sputtering, wherein said antireflective layer is not disposed on the masked portion of said antistatic layer leaving the masked portion of said antistatic layer exposed for connection to an electrically grounded conductor for directing electrostatic charge on the display screen to neutral ground.

1 more element

Apparatus for depositing an antistatic/antireflective coating on an outer surface of a glass display screen of a CRT, wherein a video image is produced on the glass display screen by plural electron beams incident upon a light emitting coating disposed on an inner surface of said glass display screen, and wherein an electrostatic charge is produced on said display screen by said electron beams incident thereon and incident light is reflected by said display screen, said apparatus comprising:

a sputtering system for directing an electrically conductive antistatic material onto the outer surface of the glass display screen in forming an inner antistatic layer followed by directing an insulative antireflective material onto said inner antistatic layer in forming an outer antireflective layer;
and
a masking arrangement disposed adjacent the outer surface of the glass display screen for covering a peripheral portion of said inner antistatic layer prior to directing said insulative antireflective material onto said inner antistatic layer and preventing the directing of said antireflective material onto a portion of said inner antistatic layer in forming an exposed portion of said inner antistatic layer, wherein the exposed portion of said inner antistatic layer is adapted for coupling to a grounded electrical conductor for directing electrostatic charge on the display screen to neutral ground.

Dependencies are inferred from the claim text.

Application of antistatic/antireflective coating to a video display screen

Life of this patent

Application of antistatic/antireflective coating to a video display screen

Life of this patent

Abstract

Claims8